Hi, I have a function like void myLog(const char *format, ...); Now I want to let the compiler check the passed parameters if they fit to the format string like printf. I know this can be done easily with the following: void myLog(const char *format, ...) __attribute__((format(printf, 1, 2))); Now my problem is: I also want to accept the "%@" specifier that is accepted in Obj-C NSStrings or NSLog. The "%@" specifier accepts Obj-C objects (NSObject or id) or Core Foundation Object References (CFTypeRef). I saw that NSLog is declared this way: void NSLog(NSString *format, ...) __attribute__((format(__NSString__, 1, 2))); Problem is that I don't have an NSString as format string parameter in my function. I have a plain old C-string (it should also work in C++ code, not only in Obj-C or Obj-C++ code). But it accepts the "%@" specifier (I am using Core Foundation in the Implementation under-the-hood). When I use the __NSString__ declaration like NSLog, gcc gives me an error message that my format parameter is not an NSString. Sure, it is not. But it doesn't matter. I just want gcc to do the format parameter checking like that. Is there any chance to get gcc check my passed parameters the "Objective-C way" with "%@" included but still having the format string passed as plain old C-string? It there any other types than __NSString__ I could try? BTW, is there an official list what types are accepted by __attribute__((format(...))) ? Thanks, Mani -- http://mani.de - friendly software iVolume - listen to music hands-free LittleSecrets - the encrypted notepad
